According to Literature Alive by Cay Gibson, a commonplace book is a "bound volume in which...readers...would copy out their favorite poems from manuscript" (page 97). This idea appealed to me because I'm always coming across things I want to write down. So, using one of Dawn's ideas, I made a commonplace book for me.
Using the above supplies, I made these:
The one on the left is my new prayer journal and the one on the right is my commonplace book. I can't wait to start using them.